It's because They may be fitted with supplemental actions for security since the heavier the scooter, the upper the pace, and thus, the greater the necessity for more State-of-the-art safety functions like twin stem locking mechanisms. Oh and this is the list for adult folding electric scooters by the way. https://medium.com/@abiron5776786gg/where-to-buy-scorpius-a-electric-scooter-5b624b2e789a